Skin types are generally classified into five categories: normal, dry, oily, combination, and sensitive. Normal skin has a balanced level of moisture and oil, while dry skin lacks hydration and may feel tight or rough. Oily skin produces excess sebum, leading to a shiny appearance and potential acne. Combination skin exhibits characteristics of both oily and dry skin, often with an oily T-zone and dry cheeks. Sensitive skin is prone to irritation and may react negatively to products or environmental factors. Understanding your skin type can help in choosing the right skincare products and routines.